Hole-cutting device



M37 7, 1925. 1,545,029- B. H. BECHTQLD HOLE CUTTING DEVI ck Filed July 17, 1924 2 sh et -sheen 1 July 7, 1925. 1,545,029

' B. H. BECHTOLD HOLE CUTTING DEVI CE.

Filed July 17, 1924 2 Sheets-Sheet 2 Fig.2- Fig.5. m L i i- 0 v J x 4a 7 M; 5 m] I I 1 1r a" .2 3 l /a v I E J2 Jr V w a ATTIJRHELIS:

cutting holes in metal by a cutting wheel as carry the operating mechanism later to be -by a hub 4c; the arm 3 by a hub 5.

the arm 2 and adjustable thereon is a screw Patented July 7, 1925.

BENJAMIN I-I. BECHTOLD, or BosT'oN, MASSACHUSETTS.

HOLE-CUTTING DEVICE.

Application filed July 17,

To (all whom it may concern:

Be it known that I, BENJAMIN H. BECH- TOLD, of Boston, in the county of Suffolk and State of Massachusetts, a citizen of the United States, have invented anew and useful Improvement in Hole-Cutting Devices, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature.

The invention relates toa device for cutting holes in sheet metal or other hard substances in sheet form. The device pertains essentially to one in Which holes of an appreciable size are out by means of a cutting wheel, although the adaptability of the tie vice is such that it may be used for making holes by punching or boring.

The object of the invention is to provide a device workable under substantially all circumstances in which a device of the pres ent kind could practically be used, and one that will efliciently perform the work for which it is designed.

which- Figure 1 shows the device in side elevation. 1'

Fig. is a vertical section of the device showing the interior of its various working parts. 7

Fig. 3 is a view partly in side elevation and partly in section for illustrating especially the adaptability of the device for contrasted with Fig. 2 in which the adaptability of the device as a punch is shown.

, Fig. 4c is a view mainly in vertical section of such portion of the device as will show its adaptability for boring holes in metal.

Referring to the drawings '2- 1 represents the frame, preferably bowshaped with outwardly extending spaced arms 2 and 3, respectively. These arms referred to between which the work is clamped, the frame extending around the work and its arms 2 and 3 overlapping and underlapping the same, respectively. The arm 2 is reinforced or thickened at its end Passed through the hub 4 on the end of 6 having a hollow enlarged head 7. The

exterior of the head is made polygonal in 1924. Serial No. 726,497.

order that the screw may be turned by the application of a wrench to it. The interior of the head presents a cylindrical socket 8 within which are contained complementary toothed ratchet members 11 and 12, respectively. The member 11 is located at the bottom of the socket resting to turn thereon. Afiixed to this member and extendin therefrom straight through the centre of the screw 6 is a spindle 13, the spindle extending to a point beyond the lower end of the screw where the spindle is enlarged to form a tool holder 14. The spindle 13 is aihxed to the ratchet member 11 by providing the spindle with a squared head 15 which fits in a correspondingly=formed socket within the member 11 and is held in place by a screw 16 passed through the ratchet member from the upper side thereof, entering the head of the spindle. The clutch member 12 has aliixed to it by preferably integral connection a spindle 17. This spindle projects upwardly from'within the socket 8 beyond the head 7 of the screw 6 and the end 18 thereof is made squared in order that it may be turned by a wrench applied to it. The open end of the socket 8 is closed by an adjustable washer 19 which fits around the shank of the spindle 17 and is threaded to the head. Between the washer and the ratchet member 12 is interposed a spring 20 acting to hold the ratchet members normally in operative contact with one-another but permitting by its yielding of the member 12 riding over the member 11 on a reverse turnmg thereof for obtaining a fresh grip ao- 1 cording to customary ratchet movement. The washer 19 by its permitted adjustment 'hetween this shoulder and the bottom end of the screw 6, fitting around the spindle, is

placed a ball-thrust bearing 22.

Attached to the lower end of the tool holder 14 is a punch 23s This punch is provided with a shank 2a which fitswithin a socket formed in the lower end of the tool holder, the unch being held securely in place by a set screw 25 passed through the side of the tool holder and engaging the shank of the punch.

Extendin laterall through a squared hole or opening in the tool holder 14 and 'ried by the arm 0 justable work table 31. This work table has aiiixed to it, preferably by integral connection, a screw 32 which extends through the hub 4 of the arm 2 of the frame and is adjustable thereon for raising or lowering the table, the table being held in any adjusted position by means of a set screw 83 passed through the hub 41 and engaging the side of the. screw 38.

35 is adie for the punch. This die is in the nature of an exteriorlythreaded sleeve passed through the table and its screw32 and is adjustable thereon,

the die being so adjusted that thertop end thereofwill lie flush with the top surface of the table. The die by reason of its threaded connection is an interchangeable fitting, a

I die; being employed properly complementary to the punch.

The device may be used for punching,

cutting or drilling holes in sheet metal.

When the device is used as a punch, as

shown in Fig. 2, the cutter bar 26 and cutting wheel carried by it is first removed.

The work a is then placed upon the work table and the punch driven through the work by turning the screw ,6 on the application of a wrench to the head of the screw,

the tool holder anchpunch being moved down and. thepunch forced through the -work by the thrust of the screw. During this operation the punch, will be driven straight through the work without turning for the tool holder 14 carrying the punch a while moved downwardly with the screw will'not turn with it owing tothe thrustball bearing between the tool holder and the lower end of the screw. A reverse turn ingof the screw 6 will release the punch.

When the device is being used for the purpose of cutting holes of an appreciable size by means of the cutting wheel the operation 1 is as follows: The cutter bar is first adjusted and tightened in place for cutting ahole of the desired diameter. The screw 6 is then turned down and the punch 23 passed through the work and into the opening in the work table entering the die. The punch will then be held centered by the surrounding wall of the opening within which it is contained and will operate to center the 1 work and also provide a fixed axis for the cutting wheel 28 preliminary to and during the ensuing cutting operation. vThe lowerj'ing-of the screw dis continued until the cutting wheel 1s=brought into engagement with the work. Thereupon the cutting wheel is turned by an application of power through a wrench applied to the head 18 of the spindle 17 fixed to the ratchet member 12, the turning of the ratchet member 12 operating through the ratchet member 11 and spindle 13 to turn the tool holder and cutting wheel carried by it around the axis of the punch maintained as aforesaid. During this operation the screw 6 remains passive. With ordinary sheet metal, if not too thick, the cutting wheel will operate to out a hole in the metal without further tightening of the screw 6. Under some circumstances,"

however, it is necessary after an initial action of the cutting wheel to further tighten the cutting wheel against the work by turning the screw 6, the operation being continued until the wheel finally cuts the hole in the work.

The device will also function for operating a drill 36 as shown in Fig. 4;. In such case the shank of the drill is placed within a bushing 37 which fits within the socket formed in the lower end of the tool holder, the bushing being held securely in place by the set screw 25. The drill is passed through the work by progressive turnings of the screw 6 and spindle 13.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States 1. In a hole-cutting device, the combination with a supporting frame, of a screw member arranged to turn in said frame and provided with a chambered polygonal head by which it may be turned, a spindle extending through said screw and rotatableindependently thereof, a tool holder carried by the spindle arranged-beyond the end of the screw, a tool carried by the tool holder, a

' friction bearing interposed between said tool holder and said end of the screw, ratchet members located within said head for turning said spindle, one of said membersoonnecting with said spindle, and means whereby power may be applied'to the other of said ratchet members from outside the head for rotating said spindle.

. 2. In a hole-cutting tion with a supporting frame, of a screw member arranged to turnin said frame and device, the combinaprovided with a chambered polygonal head 7 by which it may be turned, a spindle extendfriction bearing interposed between said tool holder and said 'end of the screw, ratchet members located within said head for turning said spindle, one of said members connecting with said spindle, a spindle extending from the other of said ratchet members to a point outside the-head and presenting an end by which it may be turned, a tension member having bearing against said other of the ratchet members, and an adjustable washer threaded in said head retaining said tensdion member and closing the end of the hea 3. A hole-cutting device comprising separate elements, one a work-centering element and the other a work-cutting element arranged to describe when turned a circle around the aXis of said centering element, a work table having an opening in it and into which opening said centering element is adapted to fit, means for supporting said elements and work table to occupy a determinate relationship to one another, means whereby both elements may be operated and the centering element pass through the work centering it and enter the opening in the work table to become centered by the surrounding wall of said opening preliminary to the engagement of the other element with the work, and means for turning said other element.

4. A hole-cutting device comprising separate elements, one a work-centering element and the other a work-cutting element arranged to describe when turned a circle around the axis of said centering element, a Work table having an opening in it into which said centering element is adapted to fit, a common support for said elements and work tab-1e, means for adjustably mounting said work table on said support, means whereby both elements may be operated and the centering element pass through the work centering it and enter the opening in the work table and become centered by the surrounding wall of said opening preliminary to the engagement of the other element with the work, and means for turning said other element.

5. A hole-cutting 'device comprising separate elements, one a work-cutting and centering element and the other a work-cutting element arranged to describe when turned a circle around the-axis of said centering element, a work table having an opening in it and in which opening said centering element is adapted to fit, means whereby both elements may be made to have working engagement with the work on said table and the centering element made to pass through the work centering it and enter the opening in the work table to become centered by the surrounding Wall of said opening preliminary to the engagement of the other of said elements with the work, and means for turning said other of the elements.

6. A hole-cutting device comprising separate elements, one a combined work-cutting and centering element and the other a workcutting element arranged to describe when turned a circle around the axis of said centering element, a Work table having an opening in it and in which opening said centering element is adapted to fit, a common support for said elements and work table, means for adjustably mounting said work table on said support, means whereby both elements may be made to have working engagement with the work on said table and the centering element pass through the work centering it and enter the opening in the work table to become centered by the surrounding wall of said opening preliminary to the engagement of the other of said elements with the work, and means for turning said other element.

BENJAMIN H. BECHTOLD. 

